Fix typo in toplevel.rs

[wtachau]

Fix typo

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.25%. Comparing base (43684d8) to head (521d077).

Files	Patch %	Lines
src/toplevel.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   97.83%   97.25%   -0.59%     
==========================================
  Files          14       14              
  Lines         648      656       +8     
  Branches      648      656       +8     
==========================================
+ Hits          634      638       +4     
- Partials       14       18       +4     

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